I know I have posted this question before, but I still just don't understand how to determine disk space. This server is an IBM RS6000 running on AIX version 4.2.1.
I in essence need to know the following if anyone can assist me.
1) I need to know how many drives are configured in the... (2 Replies)
Hello,
Can someone please tell me which command to use to determine the available disk space on a given disk device?
I have to write a shell script that compresses files and stores them in a specific location but I am not sure how "conservative" I should be?
Thanks in advance!
Al. (4 Replies)
Hi
is there a cmd in hpux 11 to determine the physical size of the hard disk.
not bdf command.
i have searched the other threads here but cant find an answer.
thank you guys (4 Replies)
Hello, I am trying to understand how to calculate actual disk space on a logical volume. Based on the output below, how would I convert the total and free PPs to MB and GB? Thank you.
# lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: ... (4 Replies)
Hello,
I would like to free some space to install gcc with is about 50M large, and I have no free space on my system. What can I delete?
Filesystem 1024-blocks Used Free %Used Iused Ifree %Iused Mounted on
/dev/hd4 262144 145436 116708 56% 7981 ... (10 Replies)
Version: Solaris 10 (August 2011) on VM
I am kind of new to Solaris.From VM workstation i allocated 35 GB to this Solaris VM's Disk
The disk was named
c1t0d0
Few basic slices for root(8gb), swap(517mb) and /export/home(494mb) were created by the solaris Installer during the... (18 Replies)
hello folks,
I have a 300GB ROOTVG volume groups with one filesystem /backup having 200GB allocated space
Now, I cannot alt disk clone or mirrorvg this hdisk with another smaller disk. The disk size has to be 300GB; I tried alt disk clone and mirrorvg , it doesn't work. you cannot copy LVs as... (9 Replies)
Discussion started by: filosophizer
9 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)